topic Problem with the external modem port on K-Class server. Cannot open port (Device busy) in Operating System - HP-UX

Problem with the external modem port on K-Class server. Cannot open port (Device busy)

ksantini — Thu, 14 Dec 2000 18:12:45 GMT

Hei,

I am having a problem with the external modem port onthe core I/O board of a K-Class server. The setup involves a bisync modem which is connected to the port (labelled tty0p7) through a cleo convertor box.

The setup was working fine for about a week and a half.

The problem now is that no matter what is sent to the port, the respond is "cannot open port, (DEVICE BUSY), and/or cannot create specified file.

The modem setup guide requires that the port be setup as a terminal and that the getty procees not be running on it (i.e. turn the port off through modifying the inittab file and rebooting).

Is there a possibility that the port gets locked through some sort of a lock file?

All help is greatly appreciated.

Thanks

Karen

Re: Problem with the external modem port on K-Class server. Cannot open port (Device busy)

Madhu Sudhan_1 — Thu, 14 Dec 2000 18:34:20 GMT

Couple of things. What is the purpose of this modem is it use for appliation specific protocols or remote dialin/dialouts etc.
If it is for remote administration then you should have getty running on it.

Did you try reseting the modem ?

...Madhu

Re: Problem with the external modem port on K-Class server. Cannot open port (Device busy)

Kofi ARTHIABAH — Thu, 14 Dec 2000 18:39:09 GMT

Karen:

I would try power-cycling the modem, and/or run lsof to see if there is any process holding tty0p7...

Re: Problem with the external modem port on K-Class server. Cannot open port (Device busy)

Devbinder Singh Marway — Thu, 14 Dec 2000 18:56:42 GMT

Try doing fuser /dev/ to see what else if anything is running on the port.

Also check for lock files in /usr/lib/uucp files begin with LCK* if one exists , remove it.

ALso have a look at the following links :-

http://europe-support.external.hp.com/cki/bin/doc.pl/sid=0938f8b31ac41884a1/screen=ckiSearchResults?mode=id&searchString=KBAN00000225

http://my1.itrc.hp.com/cm/QuestionAnswer/1,1150,0xe9c1119c3420d411b66300108302854d!1,00.html

HTH

Re: Problem with the external modem port on K-Class server. Cannot open port (Device busy)

ksantini — Thu, 14 Dec 2000 21:08:34 GMT

Thank you all for your responses.

The setup is actually used for a bisync modem using a Cleo convertor box.

The actual problem was that we needed to unlock the port at the hardware level (Ctrl-B, ur). We had tried all other things, such as removing and re-installing the device,resetting the modem and the convertor box (quite a few times) and even rebooting a few times.

Anyways, the Ctrl-B and ur (to unlock remote port and then using dr to disable remote access) worked fine....just in case someone else has the same issue.

thanks again.

K.